Electric-lamp cut-out.



H. S. D'UNNING ELECTRIC LAMP GUT-OUT. APPLIGATSIONQI'ILED AUG.6, 1910.

Patented July 8, 1913.

WITNESSES:

2 UNITED STATES PATENT OFFICE.

HERBERT s. DUNNIN'G, or EAST ORANGE, NEW JERSEY, ASSIGNOR o WESTINGHOUSE LAMP COMPANY, n CORPORATION 011 PENNSYLVANIA,

ELECTRIC-LAMP GUT-OUT.

Specification '61. Letters'latent.

Application filed August 6, 1910. SeriaI No. 576,001.

To all whom it may concern:

Be it known that I, HERBERT S. DUNN- ING, a citizen of the United States, and a resident of East Orange, in the countyof 'Essex and State of New Jersey, have invented a new and useful Improvement in Electric-Lamp Cut-Outs, of which the following is a specification.

My invention relates to cut-out devices for electric incandescent lamps andit has for its object to provide a self-contained lamp and cut-out which shall. be simple in construction and eifectii e in operation.

Figure 1 of the accompanying drawing is a sectional view of the base portion of a lamp that embodies my invention, and Fig. 2 is a plan view of one of the parts of the said lamp.

The present lamp is provided with the usual base comprising a threaded cylindrical shell 1 that is connected to one of t-heterminals or leading-in wires 2 of the lamp,-an insulating end member 3 therefor, and a conducting tip or plate 4 that is I mounted on the said insulating member and is connected to the other terminal or leading-in wire 5 of the lamp.

lVithin-the cylindrical shell 1 and extending across the same adjacent to the inner face of the insulating end member 3, is a resilient conducting strip 6 having a stem 7. that extends through the end'member 3 and is connected tothe conducting plate t.

The extremities of the strip 6 are rounded inwardly and are resiliently pressed toward the cylindrical shell 8 but are normally maintained out of engagement therewith by insulating films 9 that are punctured or destroyed when the voltage between the saidparts becomes excessive. The insulating films may be composed of any suitable ma- Copies of this patent may be obtained for five cents each, by addressing the commissionei' etlfatcnts.

terial, such as mica or bc-rax. Thus, the terminals of the lamp are separated by only thin-films of insulating material, and when the filament of the lamp becomes broken, or the lamp is otherwise damaged, the volt age between themember 6 and the cylindrical shell 1 becomes sufiicient to puncture the insulating film or films, and the lamp is automatically short-circuited.

I claim as my invention:

1. An incandescent lamp comprising a conducting base member, a resilient conducting member within the same, and an insulating film separating the said members and pressed by' the resilient member against the base member.

2. In an incandescent lamp, the combination with a base comprising a conducting shell, an insulating end member, and an outer plate for the end member, of a conducting member extending across the inner face of the insulating end member and connected to said 'olate, and an insulating film between the conductingnieinber' and the shell.

conducting base member that is connected An incandescent lamp comprising a Patented July 3,1913.

to one terminal of the lamp, a resilient conducting member that is within the base member and is connected to the other terminal of the lamp, and an insulating filnr between the-said members and pressed by the resilient-member against the base member. A

In testimony whereof, I have hereunto subscribed iny name this 21st ,day o-f'July,

HERBERT S. DUNNING. Witnesses CHARLES E. KELLY, ()rro S. SCHAIRER.

Washington, D. C. 

